iio: adc: add support for ad4052

The AD4052/AD4058/AD4050/AD4056 are versatile, 16-bit/12-bit,
successive approximation register (SAR) analog-to-digital converter (ADC)
that enables low-power, high-density data acquisition solutions without
sacrificing precision.
This ADC offers a unique balance of performance and power efficiency,
plus innovative features for seamlessly switching between high-resolution
and low-power modes tailored to the immediate needs of the system.
The AD4052/AD4058/AD4050/AD4056 are ideal for battery-powered,
compact data acquisition and edge sensing applications.

Signed-off-by: Jorge Marques <jorge.marques@analog.com>

Author: gastmaier

drivers/iio/adc/Kconfig

@@ -56,6 +56,20 @@ config AD400X
 	  To compile this driver as a module, choose M here: the module will be
 	  called ad400x.
 
+config AD4052
+	tristate "Analog Devices AD4052 Driver"
+	depends on SPI && PWM
+	select IIO_BUFFER
+	select IIO_BUFFER_DMA
+	select IIO_BUFFER_DMAENGINE
+	select REGMAP_SPI
+	help
+	  Say yes here to build support for Analog Devices AD4052 SPI analog
+	  to digital converters (ADC).
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called ad4052.
+
 config AD4130
 	tristate "Analog Device AD4130 ADC Driver"
 	depends on SPI

drivers/iio/adc/Makefile

@@ -9,6 +9,7 @@ obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o
 obj-$(CONFIG_AD_PULSAR) += ad_pulsar.o
 obj-$(CONFIG_AD400X) += ad400x.o
 obj-$(CONFIG_AD4000) += ad4000.o
+obj-$(CONFIG_AD4052) += ad4052.o
 obj-$(CONFIG_AD4130) += ad4130.o
 obj-$(CONFIG_AD4134) += ad4134.o
 obj-$(CONFIG_AD4630) += ad4630.o